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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 30, 2019 shares	May 13, 2019 $ / shares shares	May 06, 2019 $ / shares shares	May 31, 2014 shares	Jun. 30, 2014 shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares
Share-based Compensation, Aggregate Disclosures:
Maximum number of shares per participant, 12 month period (in shares)				1,000,000.0	2,500,000
Extension of plan term					10 years
Share-based compensation costs charged against income | $						$ 2,500	$ 2,700	$ 3,900	$ 4,300
Tax benefit recognized from share-based compensation expense | $						400	$ 500	600	800
Unrecognized compensation costs related to nonvested awards | $						$ 9,200		$ 9,200
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition								1 year
Total fair value of vested shares | $								$ 7,400	11,900
Proceeds from exercise of stock options | $								544	1,028
Tax benefit realized from exercise of stock options | $								$ 400	$ 1,200
Shares available for issuance under the Plan (in shares)						1,400,000		1,400,000
Stock options granted (in shares)								302,700	294,500
Options, Additional Disclosures:
Options granted, weighted-average grant-date fair value (in USD per share) | $ / shares								$ 10.83	$ 10.22
Options exercised, aggregate intrinsic value | $								$ 100
Performance Shares
Share-based Compensation, Aggregate Disclosures:
Share grants in period (in shares)			98,644
Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Share grants in period (in shares)	4,183	7,287	89,286					220,300	226,400
Restricted Stock Units (RSUs) | Employee
Restricted Shares
Award vesting period								3 years
Restricted Stock Units (RSUs) | Employee | Maximum
Restricted Shares
Award vesting period								3 years
Restricted Stock Units (RSUs) | Director
Restricted Shares
Conversion ratio for common shares into which each RSU may be converted								1
Period following director's term in which RSUs may be settled								6 months
Stock Options
Share-based Compensation, Aggregate Disclosures:
Stock options granted (in shares)		21,194	281,487
Stock options granted, exercise price (in USD per share) | $ / shares		$ 30.19	$ 30.56
Stock Options | Minimum
Restricted Shares
Award vesting period								3 years
Stock Options | Maximum
Restricted Shares
Award vesting period								5 years
Options, Additional Disclosures:
Award exercisability period, from date of grant								10 years
Long-term Equity Incentive Plan, 2005
Share-based Compensation, Aggregate Disclosures:
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares)				5,000,000.0
Number of additional shares authorized (in shares)					1,800,000

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